Regarding Choppers though, depending on circumstances, you may or may not want to try to chain your Chopper calls...meaning once you get a Chopper, you can call in the Chopper whenever you feel like, even after you die (assuming it can not be over-ridden by a UAV). In general, what people (including me) tend to do is get the Chopper, die (either kill yourself (cook a frag, jump off a roof) or go Gung-Ho), and then call in the Chopper when you re-spawn. If you can keep yourself alive, the Chopper kills will count towards building your next UAV-Airstrike-Chopper count.